Problem Statement

There is an enemy with stamina $A$. Every time you attack the enemy, its stamina reduces by $B$.

At least how many times do you need to attack the enemy to make its stamina $0$ or less?

Constraints

• $1 \\le A,B \\le 10^{18}$
• $A$ and $B$ are integers.

Input

The input is given from Standard Input in the following format:

$A$ $B$

Output

Print the answer.

Sample Input 1

7 3

Sample Output 1

3

Attacking three times make the enemy's stamina $\-2$.

Attacking only twice makes the stamina $1$, so you need to attack it three times.

Sample Input 2

123456789123456789 987654321

Sample Output 2

124999999

Sample Input 3

999999999999999998 2

Sample Output 3

499999999999999999